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(No Model.) 2 Sheets-Sheet 1.

F. DUHRKOP. BAKERS OVEN.

No. 465,923. Patented Dec. 29, 1891.

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(Np Model.) 7 2 Sheets-Sheet 2.

F. DUHRKOP.

BAKERS OVEN.

No. 465,923. Patented Dec. 29, 1891.

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WITNESSES: I INVENTOR ATTORN EYJ'.

- proved bakers oven; Fig. 2,a vertical transthe same as described in Patent No. 380,556,

UNITED STATES PATENT OFFICE.

FRITZ DUHRKOP, OF NEW YORK, N. Y.

BAKERS OVEN.

SPECIFICATION forming part of Letters Fatent No. 465,928, dated December 29, 1891.

Application filed April 20, 1891. fierial No. 389,573. (No model.)

To all whom it may concern.-

Be it known that I, FRITZ DI'JHRKOP, of New York city, New York, have invented an Improved Bakers Oven, of which the following is a specification.

This invention relates to a bakers oven of novel construction; and it consists in the various features of improvement more fully pointed out in the claims.

In the accompanying drawings, Figure l is a front elevation, partly in section, of my imverse section on line to as, Fig. 3; Fig. 3, avertical longitudinal section on the line y y, Fig. 2; arid Fig. 4 a horizontal section on the line 2 z, ig. 3.

The letter a represents the fire-place of the oven, which is either at the front or at the rear end, and b b are the com municatingflues.

c is an air-chamber formed beneath the floor (1' of the baking-chamber d. This air-chamber is disconnected from the heating-fines, and thus constitutes a hot-air cushion interposed between the hot-air fines and the sole of the oven. From the flues b there extend upward the vertical fiues e, that convey the heat to a heating-space formed by a doublearched roof f. All these parts are or may be granted to me April 3, 1888.

One of the objects of the present invention is to diminish the volume of heat radiated from the front wall of the oven and to thus protect the baker from the usual excessive heat. To this efieot I make the front wall of the oven double and inclose an air-space 9 within the double wall 9 g from top to bottom. The inner wall g and the outer Wall g are connected around their outer edge, and they are likewise connected around the ovendoor d as indicated by dotted lines in Fig. 1. Back of the fire-door a, Fig. 3, or at another suitable place the walls g g are, however, disconnected, as at y so that the air is free to enter the air-space g at the bottom. The air then passes upward between the walls 9 g,

and thus constitutes a highly desirable cool ,ing layer that effectively protects the baker against an excessive radiation of heat. At the top the air is discharged through an opening g and may be utilized to heat the offiee, store, 850., of the bakery.

Within the air-chamber 0 there is placed a tray h containing gravel. be moistened from a drip-cup 45 through a tube 1 At the front the floor d of the bakingchamber dis provided with a perforated plate j, through which the evaporated moisture reaches the baking-chamber. This moisture thus affects the bread, and aids to a considerable extent in giving it a fine brown crust.

WVhat I claim is' 1. A bakers oven having a double front wall that incloses an upright air-space g a fire-door ct, openings 9 back of the fire-door that communicate with the air-space, and a top air-outlet, substantially as specified.

2. A bakers oven having hot-air fines, a disconnected air-space below the bakingchamber, a heating-space above the bakingchamber, and a second air-space in front of the baking-chamber, substantially as specified.

3. The combination of baking-chamber cl, having perforated floor, with an evaporating tray beneath such fioor, substantially as speci' fied.

4. The combination of baking-chamber (1, having perforated floor, with drip cup 1', tube 4;, and tray h, substantially: as specified.

. F. DUI-IRKOP.

Witnesses:

F. v. BRIESEN, A. J ONGHMANS.

This gravel may 

